and PTE Architects), Levitt Bernstein prepared a design guide tackling the challenges of living at densities higher than 150 dwellings per hectare. David Levitt (September 2009), Housing Design Handbook, Routledge. . Higher Density Housing for Families: A Design and Specification Guide (Published by London Housing Federation, 2004): A guide developed by Helen Cope and Levitt Bernstein, with cost advisors Walker Management. The guide, which starts with a matrix of recommendations for different housing typologies, concentrates on responsible design and specification to ensure that higher density housing for families is developed in a way that maximises the advantages and avoids the pitfalls. HCA Research, Dwelling space calculator and generic plans for affordable housing(2008): Levitt Bernstein developed a simple space standards calculator to generate the minimum dwelling floor areas which would comfortably meet the current range of standards for affordable housing. External links Design companies established in 1968 Architecture firms of England Companies based in the London Borough of Islington 1968 establishments in England